1·Allelopathic effect of root exudates on pathogenic fungi of root rot in continuous cropping soybean was studied by sand culture, water culture, and indoor culture experiments.
采用砂培、水培和室内培养等试验方法研究了连作大豆根分泌物对根腐病病原菌的化感作用。
2·During recent years, continuous cropping Soybean, lack of soil tillage and lack of effective herbicide for Perennial sowthistle caused Perennial sowthistle rampant.
近年来，由于大豆连作普遍、土壤耕作次数减少且无防除苣荬菜的特效药，导致大豆田苣荬菜的危害日趋严重。
3·Objective To discuss the internal and external factors' functional mechanism of ginseng continuous cropping obstacle.
目的探讨人参连作障碍的内外在因素作用机制。
4·Cucumber, as the main protected cultivation vegetable, is sensitive to continuous cropping.
黄瓜是设施栽培的主要蔬菜作物，对连作反应敏感。